<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>

<body>
    <div id="app">
        <input type="text" v-color="msg" />
        <input type="text" v-focus />
    </div>
    <script src="../vue.js"></script>
    <script>
        var vm = new Vue({
            el: '#app',
            data: {
                msg: {
                    color: 'skyblue',
                },
            },
            methods: {},
            directives: {
                color: {
                    inserted: function(el, params) {
                        el.style.backgroundColor = params.value.color;
                    },
                },
                focus: {
                    inserted: function(el) {
                        el.focus();
                    },
                },
            },
        });
    </script>
</body>

</html>